update.

[chise/concord.git] / read.c

diff --git a/read.c b/read.c
index 2fd1566..2e2f7fe 100644 (file)
--- a/read.c
+++ b/read.c
@@ -17,9 +17,81 @@
    02111-1307 USA.  */
 
 #include <stdlib.h>
+#include <ctype.h>
 #include "cos-read.h"
 
 int
+cos_skip_space (unsigned char *str, size_t len, size_t start, size_t* endp)
+{
+  int i = start;
+
+  while ( ( i < len ) && isspace (str[i]) )
+    {
+      i++;
+    }
+  *endp = i;
+  return i;
+}
+
+COS_object
+cos_read_int (unsigned char *str, size_t len, size_t start, size_t* endp)
+{
+  size_t i = start;
+  int c;
+  int negative_flag;
+  int dest;
+
+  if ( i < len )
+    {
+      switch ( str[i] )
+       {
+       case '+':
+         negative_flag = 0;
+         i++;
+         break;
+       case '-':
+         negative_flag = 1;
+         i++;
+         break;
+       default:
+         negative_flag = 0;
+       }
+
+      if ( (i < len) && (c = str[i++])
+          && ('0' <= c) && (c <= '9') )
+       {
+         dest = c - '0';
+
+         while ( i < len )
+           {
+             c = str[i];
+             if ( ('0' <= c) && (c <= '9') )
+               {
+                 dest = dest * 10 + c - '0';
+                 i++;
+               }
+             else if ( isspace (c)
+                       || ( c == '(' )
+                       || ( c == ')' )
+                       || ( c == '[' )
+                       || ( c == ']' )
+                       || ( c == '"' ) )
+               {
+                 *endp = i;
+                 return cos_make_int ( negative_flag ? - dest : dest );
+               }
+             else
+               return NULL;
+           }
+         *endp = i;
+         return cos_make_int ( negative_flag ? - dest : dest );
+       }
+    }
+  return NULL;
+}
+
+
+int
 cos_read_utf8 (unsigned char *str, size_t len, size_t start, size_t* endp)
 {
   size_t i = start;
@@ -93,6 +165,7 @@ cos_read_char (unsigned char *str, size_t len, size_t start, size_t* endp)
   return -1;
 }
 
+
 COS_String
 cos_read_string (unsigned char *str, size_t len, size_t start, size_t* endp)
 {
@@ -119,3 +192,109 @@ cos_read_string (unsigned char *str, size_t len, size_t start, size_t* endp)
     }
   return NULL;
 }
+
+
+static COS_Cons
+cos_read_list0 (unsigned char *str, size_t len, size_t start, size_t* endp)
+{
+  size_t i = start;
+
+  i = cos_skip_space (str, len, i, endp);
+  if ( len >= start + 1 )
+    {
+      COS_object car = cos_read_object (str, len, i, endp);
+
+      if ( car == NULL )
+       return NULL;
+      i = *endp;
+
+      i = cos_skip_space (str, len, i, endp);
+      if ( str[i] == ')' )
+       {
+         *endp = i + 1;
+         return cos_cons (car, cos_Qnil);
+       }
+      else if ( str[i] == '.' )
+       {
+         COS_object cdr;
+
+         i++;
+         if ( isspace (str[i])
+              || ( str[i] == '"' )
+              || ( str[i] == '[' )
+              || ( str[i] == '(' ) )
+           {
+             cdr = cos_read_object (str, len, i, endp);
+             if ( cdr == NULL )
+               return NULL;
+             i = *endp;
+             i = cos_skip_space (str, len, i, endp);
+             if ( str[i] == ')' )
+               {
+                 *endp = i + 1;
+                 return cos_cons (car, cdr);
+               }
+             cos_release_object (car);
+             cos_release_object (cdr);
+             return NULL;
+           }
+         else
+           {
+             cos_release_object (car);
+             return NULL;
+           }
+       }
+      else
+       {
+         COS_object rest;
+
+         rest = cos_read_list0 (str, len, i, endp);
+         if ( rest == NULL )
+           return NULL;
+         return cos_cons (car, rest);
+       }
+    }
+  return NULL;
+}
+
+COS_Cons
+cos_read_list (unsigned char *str, size_t len, size_t start, size_t* endp)
+{
+  size_t i = start;
+
+  i = cos_skip_space (str, len, i, endp);
+  if ( (len >= start + 2) && (str[i++] == '(') )
+    {
+      return cos_read_list0 (str, len, i, endp);
+    }
+  return NULL;
+}
+
+
+COS_object
+cos_read_object (unsigned char *str, size_t len, size_t start, size_t* endp)
+{
+  COS_object val_obj;
+  int val_cid;
+  COS_String val_str;
+
+  start = cos_skip_space (str, len, start, endp);
+
+  val_obj = cos_read_int (str, len, start, endp);
+  if ( val_obj != NULL )
+    return val_obj;
+
+  val_cid = cos_read_char (str, len, start, endp);
+  if ( val_cid >= 0 )
+    return cos_make_char (val_cid);
+
+  val_str = cos_read_string (str, len, start, endp);
+  if ( val_str != NULL )
+    return val_str;
+
+  val_obj = cos_read_list (str, len, start, endp);
+  if ( val_obj != NULL )
+    return val_obj;
+
+  return NULL;
+}